Thermogravimetric study of the recovery of oxygen-deficient superconducting YBa sub 2 Cu sub 3 O sub 7 minus. delta. oxides in ambient oxygen

Journal Article · Mon Sep 25 04:00:00 EDT 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102474· OSTI ID:5422957

Shi, L T; Tu, K N ^[1]

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1. IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (US)

The oxides of oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with {delta}{congruent}0.32 in both powder and chunk form were annealed in ambient oxygen to investigate the behavior of oxygen indiffusion. Thermogravimetric measurements were used to monitor {ital in} {ital situ} weight gain during the annealing at constant heating rates between room temperature and 580 {degree}C. The temperature for achieving a definite oxygen stoichiometry changes with the heating rates, which were varied from 0.1 to 15 {degree}C/min. By measuring the rate dependence, the activation energy of oxygen diffusion in the powder oxide was determined to be 1.25{plus minus}0.05 eV, in good agreement with the value obtained by previous resistivity measurements. However, the activation energy obtained from the chunk oxide is higher, i.e., 1.52{plus minus}0.06 eV. A longer diffusion distance in the chunk oxide which requires diffusion across grains might be responsible for this discrepancy.

• OSTI ID: 5422957
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:13; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
AMPLIFICATION
ANNEALING
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
GAIN
GRAIN BOUNDARIES
GRAVIMETRIC ANALYSIS
HEAT TREATMENTS
HEATING
HIGH TEMPERATURE
LOW TEMPERATURE
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION TRANSPORT
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES